Update main.dart

Sample changes updated.

Author: Indumathi1195R

lib/main.dart

@@ -12,16 +12,15 @@ class AppointmentWithoutWeekends extends StatefulWidget {
 }
 
 class CalendarAppointment extends State<AppointmentWithoutWeekends> {
- CalendarDataSource _dataSource;
- List<String> _subjectCollection;
- List<DateTime> _startTimeCollection, _endTimeCollection;
- List<Color> _colorCollection;
- List<TimeRegion> _specialTimeRegion;
+ final CalendarDataSource _dataSource = _DataSource(<Appointment>[]);
+ final List<String> _subjectCollection = <String>[];
+ final List<DateTime> _startTimeCollection = <DateTime>[];
+ final List<DateTime> _endTimeCollection = <DateTime>[];
+ final List<Color> _colorCollection = <Color>[];
+ List<TimeRegion> _specialTimeRegion = <TimeRegion>[];
 
  @override
  void initState() {
- _dataSource = _DataSource(<Appointment>[]);
- _specialTimeRegion=<TimeRegion>[];
  _getSubjectCollection();
  _getStartTimeCollection();
  _getEndTimeCollection();
@@ -59,9 +58,9 @@ class CalendarAppointment extends State<AppointmentWithoutWeekends> {
 
  void viewChanged(ViewChangedDetails viewChangedDetails) {
  List<DateTime> visibleDates = viewChangedDetails.visibleDates;
- List<TimeRegion> _timeRegion = <TimeRegion>[];
+  List<TimeRegion> _timeRegion = <TimeRegion>[];
  List<Appointment> appointments = <Appointment>[];
- _dataSource.appointments.clear();
+ _dataSource.appointments!.clear();
 
  for (int i = 0; i < visibleDates.length; i++) {
  if (visibleDates[i].weekday == 6 || visibleDates[i].weekday == 7) {
@@ -71,8 +70,10 @@ class CalendarAppointment extends State<AppointmentWithoutWeekends> {
  startTime: DateTime(visibleDates[i].year, visibleDates[i].month,
  visibleDates[i].day, 13, 0, 0),
  endTime: DateTime(visibleDates[i].year, visibleDates[i].month,
- visibleDates[i].day, 14, 0, 0),text: 'Break',enablePointerInteraction: false));
- SchedulerBinding.instance.addPostFrameCallback((timeStamp) {
+ visibleDates[i].day, 14, 0, 0),
+ text: 'Break',
+ enablePointerInteraction: false));
+ SchedulerBinding.instance!.addPostFrameCallback((timeStamp) {
  setState(() {
  _specialTimeRegion = _timeRegion;
  });
@@ -101,14 +102,13 @@ class CalendarAppointment extends State<AppointmentWithoutWeekends> {
  }
  }
  for (int i = 0; i < appointments.length; i++) {
- _dataSource.appointments.add(appointments[i]);
+ _dataSource.appointments!.add(appointments[i]);
  }
  _dataSource.notifyListeners(
- CalendarDataSourceAction.reset, _dataSource.appointments);
+ CalendarDataSourceAction.reset, _dataSource.appointments!);
  }
 
  void _getSubjectCollection() {
- _subjectCollection = <String>[];
  _subjectCollection.add('General Meeting');
  _subjectCollection.add('Plan Execution');
  _subjectCollection.add('Project Plan');
@@ -122,7 +122,6 @@ class CalendarAppointment extends State<AppointmentWithoutWeekends> {
  }
 
  void _getStartTimeCollection() {
- _startTimeCollection = <DateTime>[];
  var currentDateTime = DateTime.now();
 
  _startTimeCollection.add(new DateTime(currentDateTime.year,
@@ -143,11 +142,9 @@ class CalendarAppointment extends State<AppointmentWithoutWeekends> {
  currentDateTime.month, currentDateTime.day, 17, 0, 0));
  _startTimeCollection.add(new DateTime(currentDateTime.year,
  currentDateTime.month, currentDateTime.day, 18, 0, 0));
-
  }
 
  void _getEndTimeCollection() {
- _endTimeCollection = <DateTime>[];
  var currentDateTime = DateTime.now();
  _endTimeCollection.add(new DateTime(currentDateTime.year,
  currentDateTime.month, currentDateTime.day, 10, 0, 0));
@@ -170,7 +167,6 @@ class CalendarAppointment extends State<AppointmentWithoutWeekends> {
  }
 
  void _getColorCollection() {
- _colorCollection = <Color>[];
  _colorCollection.add(const Color(0xFF0F8644));
  _colorCollection.add(const Color(0xFF8B1FA9));
  _colorCollection.add(const Color(0xFFD20100));